CVE-2022-49196

Local system crash via stale host-bridge reference

Published Feb 26, 2025 · Updated May 23, 2026

Use-after-free in the Linux kernel's PowerPC pseries PCI hot-plug path allows local users to crash affected systems. remove_phb_dynamic() calls device_unregister() before it finishes using phb->io_resource, so the release path can free phb before release_resource() dereferences it. The demonstrated crash requires dynamic PCI host-bridge removal on PowerPC pseries, with slub_debug and page_poison exposing the stale reference.

CVSS severity7.8
High
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux kernel's PowerPC pseries PCI hot-plug path allows local users to crash affected systems. remove_phb_dynamic() calls device_unregister() before it finishes using phb->io_resource, so the release path can free phb before release_resource() dereferences it. The demonstrated crash requires dynamic PCI host-bridge removal on PowerPC pseries, with slub_debug and page_poison exposing the stale reference.

The record

CVE
CVE-2022-49196
Published
Feb 26, 2025
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2025CVE publishedPublication date reported by the CVE source.
  2. May 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2dd9c11b9d4dfbd6c070eab7b81197f65e82f1a0 <33d39efb61a84e055ca2386157d39ebbdf6b7d31
  2. Affected versionversion=2dd9c11b9d4dfbd6c070eab7b81197f65e82f1a0 <403f9e0bc5535a0a5184d1352fa3a70e6ffacb6f
  3. Affected versionversion=2dd9c11b9d4dfbd6c070eab7b81197f65e82f1a0 <895ca4ae1f72e0a0160ab162723e59c9f265ec93
  4. Affected versionversion=2dd9c11b9d4dfbd6c070eab7b81197f65e82f1a0 <fe2640bd7a62f1f7c3f55fbda31084085075bc30
  5. Affected versionversion=3.16.39 <3.17
  6. Affected versionversion=4.7.8 <4.8
  7. Affected versionversion=4.8
  8. Affected versionversion=83573addff2b4e16df9fad9a561a0d77d554b370
  9. Affected versionversion=c3e740838fe3117413425c956ac56a5724ccd9f9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2dd9c11b9d4dfbd6c070eab7b81197f65e82f1a0 <33d39efb61a84e055ca2386157d39ebbdf6b7d31; version=2dd9c11b9d4dfbd6c070eab7b81197f65e82f1a0 <403f9e0bc5535a0a5184d1352fa3a70e6ffacb6f; version=2dd9c11b9d4dfbd6c070eab7b81197f65e82f1a0 <895ca4ae1f72e0a0160ab162723e59c9f265ec93; version=2dd9c11b9d4dfbd6c070eab7b81197f65e82f1a0 <fe2640bd7a62f1f7c3f55fbda31084085075bc30; version=3.16.39 <3.17; version=4.7.8 <4.8; version=4.8; version=83573addff2b4e16df9fad9a561a0d77d554b370; version=c3e740838fe3117413425c956ac56a5724ccd9f9

Published CVSS scores

7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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